Add demo selector as main scene

Closes #20

project/demos/DemoSelector.gd

@@ -0,0 +1,26 @@
+extends CenterContainer
+
+
+onready var list := $VBoxContainer/ItemList
+onready var button := $VBoxContainer/Button
+var selected_demo: String
+
+
+func _ready() -> void:
+	button.connect("button_down", self, "_on_Button_down")
+	button.disabled = true
+	list.connect("item_selected", self, "_on_ItemList_item_selected")
+	list.connect("item_activated", self, "_on_ItemList_item_activated")
+
+
+func _on_Button_down() -> void:
+	get_tree().change_scene(selected_demo)
+
+
+func _on_ItemList_item_selected(index: int) -> void:
+	selected_demo = list.file_paths[index]
+	button.disabled = false
+
+
+func _on_ItemList_item_activated(index: int) -> void:
+	_on_Button_down()

project/demos/DemoSelector.tscn

@@ -0,0 +1,54 @@
+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://demos/PopulateItemList.gd" type="Script" id=1]
+[ext_resource path="res://assets/theme/gdquest.theme" type="Theme" id=2]
+[ext_resource path="res://assets/sprites/background.png" type="Texture" id=3]
+[ext_resource path="res://demos/DemoSelector.gd" type="Script" id=4]
+
+[node name="DemoSelector" type="CenterContainer"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+theme = ExtResource( 2 )
+script = ExtResource( 4 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="TextureRect" type="TextureRect" parent="."]
+margin_right = 1024.0
+margin_bottom = 600.0
+rect_min_size = Vector2( 1024, 600 )
+size_flags_horizontal = 3
+size_flags_vertical = 3
+texture = ExtResource( 3 )
+expand = true
+stretch_mode = 2
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+margin_left = 170.0
+margin_top = 277.0
+margin_right = 852.0
+margin_bottom = 323.0
+rect_min_size = Vector2( 682, 0 )
+size_flags_horizontal = 3
+size_flags_vertical = 3
+
+[node name="ItemList" type="ItemList" parent="VBoxContainer"]
+margin_right = 682.0
+margin_bottom = 12.0
+size_flags_vertical = 3
+custom_constants/vseparation = 5
+custom_constants/hseparation = 20
+auto_height = true
+max_columns = 2
+same_column_width = true
+script = ExtResource( 1 )
+
+[node name="Button" type="Button" parent="VBoxContainer"]
+margin_left = 283.0
+margin_top = 20.0
+margin_right = 398.0
+margin_bottom = 46.0
+size_flags_horizontal = 4
+size_flags_vertical = 13
+text = "Load scene"

project/demos/PopulateItemList.gd

@@ -0,0 +1,64 @@
+extends ItemList
+
+
+var file_paths := PoolStringArray()
+
+
+func _ready() -> void:
+	file_paths = _find_files("./", ["*Demo.tscn"], true)
+	populate(file_paths)
+	
+
+func populate(demos: PoolStringArray) -> void:
+	for demo in demos:
+		var start: int = demo.find_last("/")+1
+		var end: int = demo.find_last("Demo")
+		var length := end - start
+		var demo_name: String = demo.substr(start, length)
+		demo_name = sentencify(demo_name)
+		add_item(demo_name)
+
+
+func sentencify(line: String) -> String:
+	var word_starts := []
+	for i in range(line.length()):
+		var code := line.ord_at(i)
+		if code < 97:
+			word_starts.append(i)
+	var sentence := ""
+	var last := 0
+	for i in range(word_starts.size()-1):
+		var start: int = word_starts[i]
+		last = word_starts[i+1]
+		var length: = last - start
+		sentence += line.substr(start, length) + " "
+	sentence += line.substr(last)
+	return sentence
+
+
+func _find_files(dirpath := "", patterns := PoolStringArray(), is_recursive := false, do_skip_hidden := true) -> PoolStringArray:
+	var file_paths: = PoolStringArray()
+	var directory: = Directory.new()
+
+	if not directory.dir_exists(dirpath):
+		printerr("The directory does not exist: %s" % dirpath)
+		return file_paths
+	if not directory.open(dirpath) == OK:
+		printerr("Could not open the following dirpath: %s" % dirpath)
+		return file_paths
+
+	directory.list_dir_begin(true, do_skip_hidden)
+	var file_name: = directory.get_next()
+	var subdirectories: = PoolStringArray()
+	while file_name != "":
+		if directory.current_is_dir() and is_recursive:
+			var subdirectory: = dirpath.plus_file(file_name)
+			file_paths.append_array(_find_files(subdirectory, patterns, is_recursive))
+		else:
+			for pattern in patterns:
+				if file_name.match(pattern):
+					file_paths.append(dirpath.plus_file(file_name))
+		file_name = directory.get_next()
+
+	directory.list_dir_end()
+	return file_paths

project/project.godot

@@ -153,11 +153,6 @@ _global_script_classes=[ {
 "class": "GSTUtils",
 "language": "GDScript",
 "path": "res://src/GSTUtils.gd"
-}, {
-"base": "EditorScript",
-"class": "ReferenceCollector",
-"language": "GDScript",
-"path": "res://ReferenceCollector.gd"
 } ]
 _global_script_class_icons={
 "GSTAgentLocation": "",
@@ -188,13 +183,13 @@ _global_script_class_icons={
 "GSTSteeringAgent": "",
 "GSTSteeringBehavior": "",
 "GSTTargetAcceleration": "",
-"GSTUtils": "",
-"ReferenceCollector": ""
+"GSTUtils": ""
 }
 
 [application]
 
 config/name="SteeringToolkit"
+run/main_scene="res://demos/DemoSelector.tscn"
 config/icon="res://icon.png"
 
 [display]

project/src/Agents/GSTSpecializedAgent.gd

@@ -9,23 +9,23 @@ class_name GSTSpecializedAgent
 # frame. When `false`, the user must keep those values updated.
 var calculate_velocities := true
 
-# If `true` and `calculate_velocities` is true, interpolates
-# the current linear velocity towards 0 by the `linear_drag_percentage` value.
+# If `true`, interpolates the current linear velocity towards 0 by the 
+# `linear_drag_percentage` value.
 # Does not apply to `RigidBody` and `RigidBody2D` nodes.
 var apply_linear_drag := true
 
-# If `true` and `calculate_velocities` is true, interpolates
-# the current angular velocity towards 0 by the `angular_drag_percentage` value.
+# If `true`, interpolates the current angular velocity towards 0 by the
+# `angular_drag_percentage` value.
 # Does not apply to `RigidBody` and `RigidBody2D` nodes.
 var apply_angular_drag := true
 
 # The percentage between the current linear velocity and 0 to interpolate by if
-# `calculate_velocities` and `apply_linear_drag` are true.
+# `apply_linear_drag` is true.
 # Does not apply to `RigidBody` and `RigidBody2D` nodes.
 var linear_drag_percentage := 0.0
 
 # The percentage between the current angular velocity and 0 to interpolate by if
-# `calculate_velocities` and `apply_angular_drag` are true.
+# `apply_angular_drag` is true.
 # Does not apply to `RigidBody` and `RigidBody2D` nodes.
 var angular_drag_percentage := 0.0